暗物质飓风：用暗物质探测器测量S1流
A Dark Matter Hurricane: Measuring the S1 Stream with Dark Matter Detectors
摘要：
最近发现的S1流以低倾角、反向旋转的轨道穿过太阳附近。S1的前身是一个矮星系，其总质量与现在的天炉座矮椭球相当，因此预计该星系流将具有显著的DM成分。我们计算的影响的S1流的WIMP和轴子探测器作为其不可测的暗分量的密度的函数。在WIMP探测器中，S1流提供更多的高能核反冲，因此将略微改善DM探测前景。我们发现，即使S1包括小于10%的局部密度，多吨氙WIMP探测器可以区分S1流从散装晕在相对较窄的质量范围内5和25 GeV之间。在定向WIMP探测器如CYGNUS中，S1更显著地增加了DM探测前景，因为它增强了WIMP信号的各向异性。最后，我们表明，轴子haloscopes拥有迄今为止最大的潜在敏感性的S1流。一旦轴子质量被发现，S1的独特速度分布可以很容易地从轴子功率谱中提取出来。
英文摘要：
The recently discovered S1 stream passes through the Solar neighbourhood on a low inclination, counter-rotating orbit. The progenitor of S1 is a dwarf galaxy with a total mass comparable to the present-day Fornax dwarf spheroidal, so the stream is expected to have a significant DM component. We compute the effects of the S1 stream on WIMP and axion detectors as a function of the density of its unmeasured dark component. In WIMP detectors the S1 stream supplies more high energy nuclear recoils so will marginally improve DM detection prospects. We find that even if S1 comprises less than 10% of the local density, multi-ton xenon WIMP detectors can distinguish the S1 stream from the bulk halo in the relatively narrow mass range between 5 and 25 GeV. In directional WIMP detectors such as CYGNUS, S1 increases DM detection prospects more substantially since it enhances the anisotropy of the WIMP signal. Finally, we show that axion haloscopes possess by far the greatest potential sensitivity to the S1 stream. Once the axion mass has been discovered, the distinctive velocity distribution of S1 can easily be extracted from the axion power spectrum.
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